DUBAI - Yemeni Shi'ite rebels opened fire on an official at the Interior Ministry, violating a ceasefire with the government, Al-Arabiya television said on Friday. The network gave no further information and did not specify its source. The Yemeni government and the northern rebels said on Thursday they had agreed to a truce to end a war that has raged sporadically since 2004 and drawn in neighboring Saudi Arabia.